Conical Mesh Sand-Boil Filter for Levee Stability
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Solution Overview
Problem
Conventional methods for controlling sand boils, such as forming a body of water or dumping material, are labor-intensive, costly, and can lead to the formation of new sand boils due to increased hydrostatic pressure, posing a risk to levee stability.
Innovation Solution
A conical sand-boil filter made of mesh material with strategically placed mesh holes allows water to flow while preventing sand particles from passing through, inhibiting the growth of sand boils by maintaining underground hydrostatic pressure and preventing erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a body of water is formed above the sand boil to create hydrostatic pressure, then the flow of water and sand through the boil is slowed, but new sand boils may form nearby due to increased underground hydrostatic pressure
Solution Approach 1:
The patent employs a porous plug or filter material inserted into the sand boil that allows water to pass through while trapping sand particles. This porous structure reduces water flow and stabilizes the sand boil without significantly increasing underground hydrostatic pressure, thereby preventing the formation of new sand boils while maintaining control effectiveness
Solution Approach 2:
The porous plug acts as an intermediary element between the water flow and the sand particles. It mediates the interaction by allowing water to pass while blocking sand, thus controlling the sand boil through filtration rather than through high hydrostatic pressure, which avoids creating new sand boils
2Reliability
If sandbags or barrels are used to create a body of water over the sand boil, then water flow is reduced, but the method becomes labor intensive and costly
Solution Approach 1:
The patent extracts the essential function of sandbag rings or barrels (controlling water flow) and implements it through a simple porous plug inserted directly into the sand boil. This eliminates the need for labor-intensive assembly of sandbags or barrels while achieving the same flow control effect, significantly reducing installation complexity and cost
Solution Approach 2:
The porous plug is a simple, inexpensive component that can be easily inserted and, if necessary, replaced. Unlike sandbag rings or barrels that require significant labor to install and maintain, the porous plug provides an economical solution that reduces both material and labor costs while maintaining sand boil control effectiveness
3Reliability
If material such as sand and gravel is dumped over the impacted area, then sand boils are controlled, but the process requires extensive use of dump trucks and bulldozers
Solution Approach 1:
The patent extracts the essential function of dumping large amounts of material (blocking sand boil flow) and replaces it with a simple porous plug insertion. This eliminates the need for extensive material transport and distribution operations, significantly improving response time and productivity while maintaining sand boil control effectiveness
Solution Approach 2:
The porous plug represents a thin, flexible filtration element that can be quickly inserted into the sand boil without requiring heavy equipment for material placement. This approach dramatically reduces the time and resources needed compared to dumping and distributing sand and gravel with bulldozers, thereby improving response time and operational productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sand-boil filter effectively reduces the rate of water and liquefied sediment flow, prevents the formation of new sand boils, and is easier to install and store compared to traditional methods, thereby enhancing levee stability without increasing hydrostatic pressure.
Implementation Method 1
a water-porous structure having a hollow conical shape and made of a mesh material having a plurality of spaced mesh holes... allow water to flow from the ground through the mesh material... blocking solid matter larger than the mesh holes from passing through
Data Source
AI summary
In certain embodiments, a sand-boil filter includes a hollow, conical, water-porous structure made of a mesh material having spaced mesh holes. The filter is inserted narrow-end down into a sand boil to allow water to flow from the ground through the mesh material and out the top of the sand boil, while blocking solid matter larger than the mesh holes from passing through the mesh material. In some implementations, the filter is filled with gravel that holds the filter in place while allowing water to flow out of the sand boil. Such filters prevent sand boils from growing while relieving the underground hydrostatic pressure that created the sand boil in the first place and inhibiting subterranean erosion that can cause failure of a nearby levee. The conical shape provides relatively large surface area that inhibits clogging and allows each filter to be used for a range of different sand-boil sizes.